AC - Power Delivery Unit (PDU) Replacement

Written By: Dozuki System
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  1. Unseat all of the Battery Backup Units (BBUs) in both power shelves . There are three in each shelf and six total per rack. This reduces the risk of electric shock. Unseat all the PSUs from the shelf.

    • Unseat all of the Battery Backup Units (BBUs) in both power shelves . There are three in each shelf and six total per rack. This reduces the risk of electric shock.

    • Unseat all the PSUs from the shelf.

    Edit

    • Identify if there are two plugs per rack or one plug per rack.

    • You should be able to see two cords coming from the top of the AC PDU with the text 'TOP SHELF' and 'BOTTOM SHELF'.

    • The plug with the white color under the three-phase AC plug is for the top shelf.

    Edit

    • Turn off the breaker above the rack.

    • Some racks may have two plugs per rack and one plug per each power shelf. If this is the case, both breakers will need to be turned off.

    Edit

    • Unplug the three-phase AC plug from the tap box.

    Edit

  5. Ensure that the green LED on the rear of the power shelf is not illuminated. A lit LED indicates 12V power from the bus bar.

    • Ensure that the green LED on the rear of the power shelf is not illuminated. A lit LED indicates 12V power from the bus bar.

    • If the 12V LED is not powered on, this indicates that there is no voltage on the rack bus bar. This will ensure a technician's safety when changing PDUs.

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  6. Unplug the blue AC input connector from the back of each shelf (the top power shelf and bottom power shelf). Depress the sides of the connector since there are latches holding the connector into the power shelf.

    • Unplug the blue AC input connector from the back of each shelf (the top power shelf and bottom power shelf).

    • Depress the sides of the connector since there are latches holding the connector into the power shelf.

    Edit

  7. To release the AC PDU, pull down on the two green tabs as shown. While pulling down on the two green tabs on the PDU, pull the PDU towards the center of the rack until the PDU is free of the roof and is able to hang downward.

    • To release the AC PDU, pull down on the two green tabs as shown.

    • While pulling down on the two green tabs on the PDU, pull the PDU towards the center of the rack until the PDU is free of the roof and is able to hang downward.

    Edit

  8. Pull the AC plug that connects to the tap box through the opening in the roof of the rack.

    • Pull the AC plug that connects to the tap box through the opening in the roof of the rack.

    • Push the AC input connector behind the shelves into the channels.

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  9. Slowly pull the AC cables out of the trough from the top of the rack.

    • Slowly pull the AC cables out of the trough from the top of the rack.

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  10. From inside the rack, send the 3-phase AC input plugs that connect to the tap box through the PDU opening from inside the rack to outside the rack so the plug lies on the rack roof or dangles along the side of the rack.

    • From inside the rack, send the 3-phase AC input plugs that connect to the tap box through the PDU opening from inside the rack to outside the rack so the plug lies on the rack roof or dangles along the side of the rack.

    Edit

  11. Locate the longer AC power cable (labeled 'BOTTOM' ) and insert into the trough with the arrow pointing down.

    • Locate the longer AC power cable (labeled 'BOTTOM' ) and insert into the trough with the arrow pointing down.

    • Feed the longer cable about half way down the trough.

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  12. Locate the shorter AC Power cable ('TOP') and insert into the trough with the arrow pointing up.

    • Locate the shorter AC Power cable ('TOP') and insert into the trough with the arrow pointing up.

    • Feed it down through the trough until the Blue AC connector emerges behind the top shelf.

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  13. Push the longer (bottom shelf) cable all the way through the trough until the blue AC connector emerges behind the bottom shelf.

    • Push the longer (bottom shelf) cable all the way through the trough until the blue AC connector emerges behind the bottom shelf.

    Edit

  14. Align the three tabs on the PDU chassis with the three slots in the top of the rack. Apply upward pressure to the bottom of the PDU so that the two green latches are depressed by the roof of the rack.

    • Align the three tabs on the PDU chassis with the three slots in the top of the rack.

    • Apply upward pressure to the bottom of the PDU so that the two green latches are depressed by the roof of the rack.

    • Slide the PDU towards the trough until the green latches snap into position.

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  15. Connect the AC power cable into the corresponding blue input connector socket.

    • Connect the AC power cable into the corresponding blue input connector socket.

    • The connector can only be inserted one way for both top and bottom power shelves.

    Edit

    • Connect the three-phase AC connector into the tap box.

    • Turn on the breaker.

    • Insert the BBUs back into the power shelf. The PSU LED should illuminate green.

    Edit
Conclusion

This work is licensed under a Creative Commons Attribution 4.0 International License.

Author

Dozuki System

Member since: 09/24/2009

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